Consolidated Statements of Changes in Stockholder's Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Preferred Equity	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2012	$ 2,936,399	$ 63,272	$ 1,750	$ 1,602,136	$ 1,281,811	$ 48,603	$ (61,173)
Comprehensive (loss) income:
Net income	47,388	0	0	0	47,388	0	0
Other comprehensive income (loss)	(5,612)	0	0	0	0	(5,612)	0
Comprehensive income (loss)	41,776
Common stock issued:
Stock-based compensation plans, net	2,177	0	0	9	(16,724)	0	18,892
Purchase of treasury stock	(33,125)	0	0	0	0	0	(33,125)
Cash dividends:
Common stock	(13,483)	0	0	0	(13,483)	0	0
Preferred stock	(1,300)	0	0	0	(1,300)	0	0
Issuance of preferred stock	0	0
Accretion of preferred stock discount	0	0	0	0	0	0	0
Purchase of preferred stock	0	0	0	0	0	0	0
Stock-based compensation expense, net	3,762	0	0	3,762	0	0	0
Tax benefit of stock options	59	0	0	59	0	0	0
Ending balance at Mar. 31, 2013	2,936,265	63,272	1,750	1,605,966	1,297,692	42,991	(75,406)
Beginning balance at Dec. 31, 2013	2,891,290	61,862	1,750	1,617,990	1,392,508	(24,244)	(158,576)
Comprehensive (loss) income:
Net income	45,199	0	0	0	45,199	0	0
Other comprehensive income (loss)	12,667	0	0	0	0	12,667	0
Comprehensive income (loss)	57,866
Common stock issued:
Stock-based compensation plans, net	5,799	0	0	376	(19,173)	0	24,596
Purchase of treasury stock	(42,199)	0	0	0	0	0	(42,199)
Cash dividends:
Common stock	(14,639)	0	0	0	(14,639)	0	0
Preferred stock	(1,244)	0	0	0	(1,244)	0	0
Purchase of preferred stock	(806)	(704)	0		(102)
Stock-based compensation expense, net	4,412	0	0	4,412	0	0	0
Tax benefit of stock options	545	0	0	545	0	0	0
Ending balance at Mar. 31, 2014	$ 2,901,024	$ 61,158	$ 1,750	$ 1,623,323	$ 1,402,549	$ (11,577)	$ (176,179)